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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c76e7757932699a756985687176b7907f780479e0b5edf76c1a3bddf91a8169' 
  AND token = 'rgU1ci5sKTi9Ja7yO9joyv2UehM5z/BfHZPyG5teyxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}